Preamble Scope of this Document This document specifies the interfaces as well as the APIs in selected technologies for the Asset Administration Shells and its submodels. Structure of the Document Introduction gives an introduction to the topic. General topics are discussed in General. The query language is sepcified in Query Language. The technology-neutral specification of the interfaces of the Asset Administration Shell can be found in Clauses: API Interfaces Data Types for Payload Basic Operation Parameters Following Clauses define the API specification for HTTP/REST: HTTP/REST API Service Profiles Interactions API Code Generation Summary and Outlook provides a summary and outlook. Annex annex/serialization-modifier-examples.adoc contains examples for the serialization modifiers. Annex Backus-Naur-Form defines the grammar language used in the specification. Annex Legend for UML Modelling contains information about UML, while Annex Templates for UML Tables provides the tables used to specify UML classes etc. as used in this specification. Annex annex/api-tables-templates.adoc explains the templates used to specify operations and interfaces. Handling of Constraints explains the numbering of constraints used in the specification. Overview Constraints (non-normative) gives an (non-normative) overview of all constraints used in the documents. The Change Notes describes metamodel changes compared to previous versions. Finally, a bibliography.adoc is given.